For the 2001 BMW X5, the low-beam headlight uses a D2S bulb, while the high beam uses 9005. Verify the existing bulb and headlamp assembly before ordering, especially if the vehicle has replacement or modified lighting equipment.
Front fog-light fitment varies between H3 and H3C, so compare the original bulb and connector. The front turn signal and parking light can use either 3457 or 3457A; match the bulb already installed. Rear turn signals similarly require checking between 7506 and 7507.
Other notable exterior bulbs include 7506 for reverse lights, 7506R for brake and tail lights, 7528 for rear side markers, and 6418 for license-plate and step lights. The center stop light is listed as LED. Interior applications include 6486X for the dome light and 2886X for map, door-mirror, and trunk lighting. Compare original bulbs where multiple options are listed.